American Journal of Sports Science

Volume 9, Issue 1, March 2021

  • What Is the Effect of Physical Exercise on Nafld/Nash

    Maria Fernanda Lopes Ferreira, Icaro Putinhon Caruso, Marcelo Andres Fossey, Walnei Fernandes Barbosa, Fatima Pereira De Souza

    Issue: Volume 9, Issue 1, March 2021
    Pages: 1-7
    Received: Nov. 17, 2020
    Accepted: Jan. 14, 2021
    Published: Jan. 22, 2021
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    Abstract: Non-alcoholic fat liver disease (NAFLD) is a pathologic entity characterized by an excessive accumulation of hepatic lipid without alcohol consumption. Both endurance and strength exercise have shown to be beneficial in NAFLD. PubMed database has been searched for randomized trials and prospective cohort studies in adults aged ≥ 18, rats and mice t... Show More
  • Network Centrality and Core-periphery Analysis to Clarify the Tactics for Try in Rugby World Cup 2019

    Koh Sasaki, Takumi Yamamoto, Ichiro Watanabe, Mitsuyuki Nakayama, Kensuke Iwabuchi, Takashi Katsuta, Ichiro Kono

    Issue: Volume 9, Issue 1, March 2021
    Pages: 8-16
    Received: Jan. 07, 2021
    Accepted: Jan. 14, 2021
    Published: Jan. 28, 2021
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    Abstract: After the first World Cup 1987, rugby undergoes rule revisions aimed at more dynamic games. There have been some analyses of the KPIs (Key Performance Indicators) so far, but not many ones as detailed dynamic network structure of tactics concerned with selected attack and defense areas, plays, and human resources. In current study, the tactics for ... Show More
  • Analysis of Changes in Physical Strength over Time in Recent School-Age Students: Proposal for Multi-year Span Evaluation Chart with the O Model

    Ken-ichi Watanabe, Katsunori Fujii, Keiko Abe, Yuki Kani, Kan-ichi Mimura

    Issue: Volume 9, Issue 1, March 2021
    Pages: 17-26
    Received: Feb. 17, 2021
    Accepted: Mar. 02, 2021
    Published: Mar. 10, 2021
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    Abstract: For school-age children to lead healthy lives, they need suitable physical abilities for those lives. Together with this, measurements of physical strength and motor ability to assess those abilities could be considered essential. The physical strength of children has declined in recent years, and City O in the Kansai area of Japan has implemented ... Show More
  • Lower Limb Differences and the Center of Pressure Control Test with Visual Feedback for Junior Soccer Players

    Haruka Kawabata, Takaaki Miyake, Izumi Yoshi, Yutaro Kudo

    Issue: Volume 9, Issue 1, March 2021
    Pages: 27-31
    Received: Mar. 17, 2021
    Accepted: Apr. 02, 2021
    Published: Apr. 16, 2021
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    Abstract: This study aimed to compare the COP (center of foot pressure) control ability of junior soccer players between the kicking foot and the supporting foot using the COP control test. The participants were 40 junior soccer players (133.6±5.4 cm, 28.8±3.4 kg, 9.1±0.6 years old, soccer history: 3.8±1.3 years) belonging to a local soccer team. The COP con... Show More